A fluorophore-labeled human cell. A fluorophore (or fluorochrome, similarly to a chromophore) is a fluorescent chemical compound that can re-emit light upon light excitation. Fluorophores typically contain several combined aromatic groups, or planar or cyclic molecules with several Ï bonds.
IN THIS TOPIC. Pregnancy symptoms are different for everyone, and can vary from month to month and even from pregnancy to pregnancy. Find out what to expect, from the earliest pregnancy symptoms to the wooziness of morning sickness to the aches and pains of your third trimester.
How Long Does Morning Sickness Last During Pregnancy. Morning sickness usually begins in the first trimester of pregnancy due to a woman's body adjusting to the change in hormones. For many women, the 13th or 14th week of pregnancy marks the end of this nauseating period of time, but for others, they aren't that lucky and it can extend late into their third trimester.